Motor vehicle



Patented Jan. 9, 1922?.-

enTTTn sTATes PATENT orrice.

CHARLES R. SHORT, QF DETROIT, MICHIGAN, ASSIGNOR TO GENERAL MOTORS COM- PANY, OF DETROIT, MICHIGAN, A CORPORATION OF NEW JERSEY.

MOTOR VEHICLE.

Application filed April 6, 1917, Serial No. 160,132. Renewed April 137, 1922. SeriallNo. 552,227.

R. Siioiir,

, provide simple and improved means between a sleeve and a reciprocable plunger therein, having a lubricant arranged there` between, for preventing the discharge of the lubricant to a point eXteriorly of the sleeve.

A preferred form ofiny invention com prises in general, a guidefjsfleeve mounted in a motor crank case, with a reciprocable tappet mounted therein, with means adjacent one end of the guide sleeve for 'preventing the tappet from pumping oil to the exterioifof the sleeve. J

TheseLaiid other objects will clearly appear from the following descriptibn, taken in connection with the drawings in which:

Figure l is a side elevation, with por' tions in section7 of one end of a hydrocarbon Y* motor power plant, embodying a preferred. form of my invention; i

Figure 2 is a perspective view of apreferredforn'i of tappet assembly; and

Figure 3 is a fragmentary vertical sectional view of a modified form of my'invention.

Referring t0 the drawings, l0 represents a motor crank case on which may be suitably arranged, a multi-cylinder block ll.` A shaft l2. provided With cams 13. may be mounted in bearings 14 in the crank case 10. An overhead valve mechanism l5 may be operated through one'end 0f the rocker arms 1G. and the otherl end 1T of the rocker arms may be ,connected as by adjustable combination. a cam sha-ft andvalve mechacouplings 18 to the upper end of operating rods 19. The lower end of each of the rods 19 is adapted to be connected to a. plug membei' 20 in the upper end of a tappet 2l,

reciprocally'mounted in a guide sleeve Z2 on the crank case.

Referring particularly to Figures l and 2, it will be noted that a roller is adapted to be trunnioned in the lower vend of the tappet member 2l as by a pin 24'. This roll'- er being adapted to ride on one of the cams 13. ln the form just referred to, it is to be noted that intermediate the ends of the tappet member is a contracted offset portion or belt Q5 which is connected as by a downwardly extending groove or channel 26 with a point adjacent the roller 23. E It will be understood thatany oil which is pumped upwardly from the crank case l() by the reciprocating movements of then. tappet member 2l in its guide, will be retained by the pocket which is formed between the contractedportions of the tappet and the guide sleeve Q2, and fiom there it will flow through the channel 26 back to the lower portion of thetappet and isfina'lly returned to the'crank case.

in this guide pi'esents a straight surface 'from end to end. except for the perforation or ports 27 and 2S, which connect theext`e rior of this tappet member wit-h its interior, adjacent its-upper and lower ends-respectively. lt is to he iindei's'toodthat any lubricant which is lpumped upwardly between the tappet and the guide, will be collected in the pocket. 25, formed in the upper part`of the guide sleeve. from'which it vwill be drained to the interior of the tappet member through the p'ort 27 and discharged therefrom through the port 28.1130 the crank case 10. v

While I have described and will specifically claim what I'deem to be a preferred form of my invention, it will be obvious to those skilled' in the artr` that various modi- Iications and 4changes may be made without departing from the-spirit and scope hereof y Having thus described my invention, what .l claim andv desire tov secure by Letters Patent is: i

l. ln an internal combustion engine. iii' ranged in the bore of said guide member 'and' actuated .by said cam shaft. andihaving an oil drain passage leading from said relOO llO

(JlA

cess through the same, and discharging below Vsaid tappet guide member; and a tappet rod operatively associated with said valve mechanism and resting upon the upper end of saidcylindrical tappet.

2. In an internal combustion engine, the combination with a cam shaft and a valve mechanism, of a tappet reciproca'bly arranged in an imperforate cylindrical guide member adjacent said cam shaft, and which tappet comprises a length of tube having a shoe secured to the lower end thereof and which shoe is operativel engaged by said cam shaft and a plug tted at the upper end and forming a seat for a tappet rod which is operatively associated with said valve mechanism; said tappet-having an oil return means leading from a circumferential chamber formed thereabout intermediate the length of said guide member to the end of y said tappet adjacent said cam shaft.

3. In an internal'combustion engine and in -combination witl a cam shaft and valve mechanism, a tappet guide member having a cylindrical bore therethrough, and an internal circumferentially extending recess adjacent it's upper end; a tappet of hollow cylindrical form reciprocably arranged in the bore of said guide member and actuated at the loWer end thereof by said cam shaft, and which tappet is provided with a hole adapted to communicate with 'said recess,

vand with a second hole adjacent its lower end, whereby an oil drain passage from the upper part of said tappet to the lower part thereof below said guide member is established; and a tappet rod operatively associated with said valve mechanism and the lower end of which rests upon the upper end of said cylindrical tappet.

In testimony whereof I afiix my signature.

' CHARLES R. SHORT. 

